Patterns of recurrence after open partial horizontal laryngectomy types II and III: univariate and logistic regression analysis of risk factors
In choosing the best surgical treatment (total or partial laryngectomy) for patients affected by laryngeal squamous cell carcinoma (SCC), itis still necessary to identify a link between prognostic factors and oncological outcomes. A retrospective analysis of clinical outcomes of819 patients affected by laryngeal cancer who underwent OPHL type II and III between 1995 to 2014 was carried out. Focusing on recurrenceand its site (local, regional or distant), our cohort has been divided in two groups: patients showing recurrence (n = 108) vs thosewithout recurrence (n = 711). Thirteen clinical-pathological parameters have been studied by univariate and multivariate analysis to identifypossible correlations between recurrence and oncological outcomes (overall survival (OS), disease free survival (DFS), disease specific survival(DSS), laryngectomy free survival (LSF), laryngectomy free freedom (FFL). In multivariate analysis, we found 4 negative prognosticfactors for recurrence: site of tumour (> supraglottic), cartilage invasion (> if present), perineural invasion (> if present) and type of OPHL(> in OPHL type III). The knowledge and detection of negative prognostic factors for the risk of recurrence (pN classification, cartilageinvolvement, perineural invasion, and thus the type of surgical treatment adopted) could increase the already well-established potentialityof OPHLs in treating cases with a safe indication after careful discussion in the tumour board.
Nowadays, surgery can be offered to patients affected by laryngeal cancer as a valuable method to preserve part of the larynx and its functions, avoiding the negative physical and psychosocial impact of permanent tracheostomy 1 2. In the last decade, organ-sparing techniques have been developed and extensively used, with excellent results, as upfront treatment in early 3 4 and in selected more advanced stages (cT3 and cT4) 5. Different therapeutic options are now available for cT3 and cT4 larynx cancers 6 7 but a dichotomy exists considering locally advanced tumours: is the lesion amenable to partial laryngectomy or to total laryngectomy? During multidisciplinary discussions about larynx cancer treatment, this is not a simple question.
Each time, the surgeon faces the decision to attempt conservative treatment or to address the patient to a safer up-front total laryngectomy. The choice of treatment to recommend can be difficult to understand, especially for young or less experienced surgeons. In fact, if two lesions are at the same stage and patients are free from contraindications related to general conditions, why are they selected for different treatments?
This is because a clear consensus is still lacking for what concerns simple and objective parameters that should be used in the selection of patients amenable to one or the other technique. Although staging of laryngeal cancer has been considered for a long period the criterion that better correlates with loco-regional control and patient survival, prognosis is a complex phenomenon arising from tumour and patient characteristics, molecular biology, genetics and environment 8 9. However, the importance of each has not been unequivocally demonstrated. To complicate matters further, negative prognostic factors involved in recurrence onset are not established universally, but are important to discriminate the most suitable treatment for the patient.
The application of logistic regression models to retrospective studies allows detection and/or analysis of prognostic factors that are potentially useful to predict the main oncologic and functional outcomes. Furthermore, data emerging from large multi-institutional series of cases who were treated with the same protocols provide insights about the most controversial aspects in the treatment indications.
In this multi-institutional retrospective study, we analysed a large series of locally advanced laryngeal cancer patients treated by open partial horizontal laryngectomies (OPHL) spurred by a dual aim: a) the identification of novel prognostic factors correlating with disease recurrence; b) improvements for more correct use of OPHL as a single and up-front laryngeal cancer treatment, based on results of the previous point.
Patients and methods
The study was conducted retrospectively analysing medical records from 819 patients affected by laryngeal cancer who underwent OPHL between January 1995 and December 2014 in tertiary reference Italian hospitals: Hospital of Vittorio Veneto (Treviso), Martini Hospital (Turin), Candiolo Cancer Institute (Turin) and Policlinico Hospital (Modena). Patient characteristics, distribution according to the involved laryngeal sites, as well as their pT and pN categories (2009 TNM classification system) 10, are reported in Table I.
Inclusion criteria were histological diagnosis of glottic or supraglottic laryngeal squamous cell carcinoma (LSCC), Karnofsky index 11 higher than 80 and amenability to OPHL type II for advanced laryngeal cancers maintaining laryngeal functions 12 and type III surgeries for glottic/transglottic cancers extending to the cricoid or to extralaryngeal space 1 13 14.
Exclusion criteria were: a) purely supraglottic T3 tumour with limited extension to the pre-epiglottic space (and therefore amenable to OPHL type I or transoral laser microsurgery); b) lesions extended to base of tongue or pyriform sinus; c) lesions with major invasion of pre-epiglottic space involving the hyoid bone, involving the inter-arytenoid space, the posterior commissure and both arytenoid cartilages; d) large extralaryngeal spread of cancer involving thyroid gland, strap muscles, cervical skin, internal jugular vein or common carotid artery; e) lesions reaching the first tracheal ring; f) severe diabetes mellitus; g) severe chronic obstructive pulmonary disease; h) neurological problems impairing the ability to expectorate and/or swallow; and i) severe cardiac disease. The presence of clinically positive nodes > cN1 was not considered as an absolute contraindication. However, it should not represent a good indication for OPHL due to the probable need for post-operative radiotherapy (RT) 15.
One hundred and forty patients (17.1%) had already been treated previously for laryngeal carcinoma by CO2 transoral laser surgery (61/140; 43.6%), radiation therapy (39/140; 27.9%), laser surgery and radiation therapy (11/140; 7.8%), cordectomy (21/140; 15.0%), open partial laryngectomy (7/140; 5.0%), or chemotherapy (1/140; 0.7%).
Thirteen clinical-pathological parameters are studied as possible negative prognostic factors: previous treatments, type of surgery, tumour site, pT subcategory, pN classification, grading, cartilage involvement, vascular invasion, perineural invasion, Delphian lymph node pN+, extranodal extension (ENE), status of margins, adjuvant treatments (Table II). Age was not considered among these factors because elderly patients affected by laryngeal cancer can be treated as younger patients 16.
Total laryngectomy and OPHL Type II are the most established solutions for intermediate-advanced stage laryngeal tumours affecting the glottis. OPHL Type III, instead, is amenable to glottic/transglottic tumours with subglottic extension reaching the cricoid and glottic/transglottic T4a lesions with extralaryngeal progression through the caudal end of the thyroid cartilage and/or through the cricothyroid membrane 1.
According to this, after informed consent had been obtained, all patients underwent OPHL types II-III 17 with curative intent: type IIa = 159/819 (19.4%), type IIa+ARY = 354/819 (43.2%), type IIb = 46/819 (5.6%), type IIb+ARY = 138/819 (16.9%), type IIIa = 10 (1.2%), type IIIa+CAU = 99/819 (12.1%), type IIIb = 5/819 (0.6%), type IIIb+CAU = 8/819 (1.0%) (Table III).
Neck dissection (ND), graded according to the American Academy of Otolaryngology – Head and Neck Surgery Foundation classification 18, was performed in 704 patients (85.9%), and was unilateral in 606 (86.1%) and bilateral in 98 (13.9%) cases. ND was elective (ND levels II-IV) in 634 cN0 (90.1%) and curative in 70 cN > 0 (9.9%) patients. Level VI or unilateral paratracheal lymph node clearance was added in 449 (63.7%) patients. No ND was performed in 115 cN0 (14.1%) cases.
Based on pathological findings, 95 (11.6%) patients were subjected to adjuvant treatment. Ninety-four (99.0%) were subjected to radiotherapy. The indications were: pN>1 (60 patients - 63.8%) and/or gross extralaryngeal extension (34 patients - 36.2%) with or without positive margins. A large volume encompassing the primary site and all draining lymph nodes were irradiated with a dose of up to 54 Gy. Regions at higher risk for malignant dissemination received a 12 Gy boost (total, 66 Gy; range, 62–68 Gy). Because of a higher risk of local recurrence [Delphian nodes pN+, pN+ with extracapsular spread (ECS), more extended pT4a tumours showing positive/close margins toward pre-laryngeal tissues, perineural invasion, or cartilage invasion], 52/95 (55.3%) patients received cisplatin (100 mg/m2 on days 1, 22, and 43) concomitant with radiotherapy.
The remaining patient (1.0%) was subjected to chemotherapy alone, due to presence of distant metastasis.
OS, DSS, DFS, FFL, LFS and laryngo-oesophageal dysfunction-free (LEDFS) 19 survivals were assessed by Kaplan-Meier curves. Log-rank (LR) and Gehan-Breslow-Wilcoxon (GBW, for early events) tests were used to compare Kaplan-Meier estimates among the different subcategories.
The endpoints considered were obtained as the length of time from the date of diagnosis to: date of death (OS), date of death from disease (DSS), date of first recurrence (DFS), date of salvage laryngectomy (FFL), date of salvage total laryngectomy or date of death (LFS), date of salvage total laryngectomy or date of tracheostomy and/or PEG for functional reasons or date of death (LEDFS).
Univariate regression with collinearity analysis was used to evaluate independent risk factors (previous treatment, type of surgery, tumour site, pT stage, pN stage, grading, cartilage involvement, vascular or perineural invasion, Delphian lymph node pN+, ENE, status of margins, and adjuvant treatment). Variables were than included in logistic regression model. Kaplan-Meier curves, LR and GBW tests were performed with GraphPad Prism version 7.0a (GraphPad Software, San Diego, CA, USA), whereas univariate and multivariate regression analyses were performed with IBM® SPSS® Statistics version 24 (IBM Corp., Armonk, NY, USA). The incidences of relevant prognostic factors were analysed by a chi-squared test (PRIMIT-statistics for biomedical learning version 3.03). For all analyses, p < 0.05 was considered as the threshold for statistical significance.
Pathology reports showed close margins (< 2 mm on the specimen side) in 43 cases of 819 (5.3%) and positive margins (negative at frozen sections on the mucosa taken from the remaining larynx, but positive at definitive histopathologic examination on specimen) in 68 cases (8.3%). Positive or closed margins were associated with more advanced pT classification in both previously treated (p < 0.05) and untreated (p < 0.001) patients, while it correlated with the employment of the more aggressive OPHL type III only in previously treated patients (p < 0.01).
We detected 166 patients with cartilage invasion among the 582 (28.5%) who are affected by T3-T4 tumours (categories that could have cartilage invasion as definition). In particular, we detected the following pattern of cartilage invasion: 86/166 (51.8%) inner cortex of thyroid cartilage, 59/166 (35.5%) full thickness thyroid cartilage, 13/166 (7.8%) cricoid cartilage and 8/166 (4.9%) epiglottis cartilage. Among patients who experienced a recurrence, 50 (46.3%) had pathologic involvement of cartilages, the majority (44, 88.0%) at level of the thyroid cartilage. Furthermore, the development of recurrences and crico-arytenoid fixation did not correlate with pathological grading of lesions.
Finally, 746/819 patients (91.1%) had been staged as cN0. In contrast, 44 (5.9%) became pN+ after ND. Overall, lymph node metastases were detected in 98 (11.9%) patients, of whom 55 (56.1%) had multiple metastases.
Patterns of failure
Globally, 108 (13.2%) patients developed recurrences within 5 years after surgery. Thirty-eight patients (35.2%) displayed local recurrence, 25 patients (23.1%) regional and 8 (7.4%) distant. Twenty (18.5%) had local and regional recurrences, 6 (5.6%) were regional and distant and 4 (3.7%) local and distant recurrences. 7 patients (6.5%) developed both loco-regional and distant recurrences.
Among the 69 patients affected by local recurrence, 55 were endolaryngeal (79.7%), 9 extralaryngeal (13.0%) and 5 indeterminate (7.3%). The regional recurrences were detected on level VI in 19/58 patients (32.8%), whereas it affected levels II-V in the remaining 39 cases (67.2%). Among the latter, 34 (87.2%) recurrences were detected homolaterally, 3 contralaterally (7.7%) and 2 bilaterally (5.1%).
Recurrences were detected equally in patients who received previous treatments (21/140,15.0%) or not (87/679, 12.8%, p = 0.576). Furthermore, local recurrences displayed similar patterns between the two groups (p = 0.917). Otherwise, although the difference was not statistically significant (p = 0.065), previously treated patients seemed to have a higher incidence of regional recurrences at level VI (6/10, 60.0%) compared with the other patients (13/48, 27.1%). Furthermore, no differences (p = 0.241) were detected in terms of distant recurrences.
Similarly, no differences in terms of regional recurrences were detected between patients who underwent (47/704) or not (11/115, p = 0.356) ND. At any rate, among those who also received level VI clearance (20/449), the associated risk was higher (p = 0.055) likely due to a more advanced pathology.
Survival and disease control according to different patterns of failure
Patients were followed for a minimum period of 2 years and a maximum period of 16.4 years. The mean and the median period were 5.3 and 4.8 years, respectively. Eight patients were lost to follow-up: 3 among recurrent patients and 5 not previously treated. 5-year survival estimates are reported in Table IV. All endpoints were highly impaired by the onset of recurrences (p < 0.001, LR and GBW) compared to the non-recurring counterpart. Even if the majority of stratifications did not indicate significant differences among the different types of local recurrence, OS and DSS were more affected by local recurrences of undetermined origin. These were, indeed, more prone to induce the exitus of patients with respect to both intralaryngeal (p < 0.05, OS, and p < 0.01, DSS) and clearly extralaryngeal (p < 0.05 OS and DSS) recurrences.
Comparing previously treated and untreated patients, there was no significant differences, with the exception of the incidence of recurrence on regional lymph node (p < 0.01). This was likely because previous treatment already involved this site.
Risk analysis on the development of recurrences
At univariate analysis, all variables assessed correlated (p < 0.05) with development of recurrences. Nevertheless, at logistic regression, significantly correlated variables were pN classification (p < 0.001), presence of cartilage involvement (p < 0.001), presence of perineural invasion (p < 0.05) and type of surgical treatment (OPHL type III, p < 0.05) (Table V).
The onset of recurrences was detected in the 30.6% of patients diagnosed with pN+ cancers and in 10.5% of pN0 (RR = 3.1). Similarly, the frequencies of recurrence were higher in patients with cartilage invasion, both the inner cortex or through the outer cortex, (30.1%) and/or perineural invasions (24.7%), compared to those without these aspects (8.9% RR = 3.4 and 10.4% RR = 2.4, respectively). More extended OPHL type III entailed a 25.4% of recidivate patients, whereas the onset of recurrence after OPHL type II was limited to 11.0% (RR = 2.3). At further analysis, OPHL type III was more frequently employed in patients with previous treatment and in glottic tumours (both p < 0.001), though being responsible for a higher incidence of recurrences at level VI (p < 0.01).
T and N staging are recognised as the best factor to predict survival of patients with laryngeal cancer 20 21 24. Notwithstanding, prognosis is generally more complex and also depends on many other variables, such as age, clinical-pathologic characteristics, surgical margin status and type of surgery. Some of these could be responsible of adverse events 22, complications or even recurrences that hamper survival of patients 16. Thus, the literature is rich in manuscripts describing demographic, clinical, pathological and therapeutic variables that have been evaluated as possible prognostic factors for local control of disease and overall survival in patients affected by laryngeal cancer.
On the other hand, evaluation of prognostic factors that are expendable in predicting the onset of recurrences are not so common. The data emerging from this analysis do not correspond exactly to the few studies that have performed appropriate statistical assessment on these factors and the possible inter-relationship between them 23.
Among the few, in the analysis of 253 patients affected glottic and supraglottic laryngeal cancer and undergoing OPHL, Gallo and colleagues 20 demonstrated that the presence of positive surgical margin was the unique significant prognostic factor correlated with the onset of local recurrences. However, we should keep in mind that this was a monocentric study, homogenous regarding indications and surgical techniques and no patients were included with previous treatment for laryngeal cancer. Indeed, with regards to the major differences found between the study by Gallo and coworkers 20, focused on the parameters influencing local control and survival after supracricoid laryngectomy, it should be noted that neither T category nor positivity of resection margins correlated with the risk of recurrence.
The reason may lie in the different types of surgery adopted. In addition, in order to point out the factors that underlie the onset of recurrences (n = 108, 13.2%) in a broader cohort of patients (n = 819), we analysed oncologic results. To obtain this, we subdivided patients accordingly to their pattern of failure. All oncologic outcomes (OS, DSS, DFS, FFL, LFS, and LEDFS) were significantly impaired by the onset of recurrences though the entity was similar among the different pattern on T, N and M. However, local recurrences (T) of indeterminate origin, meaning an iceberg-like recurrence affecting in small part the remnant endolarynx, but massively the paralaryngeal tissues, were more prone to induce exitus (OS and DSS) of patients with respect to the intralaryngeal and extralaryngeal ones. In fact, in these cases it is practically impossible to carry out salvage resection in free and safe margins because diagnosis of recurrence was often late.
Considering that, as expected, recurrent patients had worse prognosis than non-recurrent ones, we evaluated the characteristics of the two populations to detect possible risk factors. Among the 13 different variables assessed, at logistic regression analysis only pN ≥ 1, cartilage invasion (both the inner cortex or through the outer cortex), perineural invasion and employment of more invasive OPHL type III were directly correlated with the onset of recurrences.
N classification has been often related to worse prognosis. In this point of view, it should not be surprising that patients classified as pN≥1 had a higher risk (RR = 3.1) to generally develop recurrences than those without lymph node involvement (pN0). Neck dissection was performed with either elective or curative purposes in the majority of patients (85.9%). Nevertheless, neck recurrences were detected in 25 of 98 (25.5%) pN+ patients, of whom 14 (14.3%) had undergone adjuvant radiotherapy or radiochemotherapy, and in 33 of 721 (4.6%) pN0 patients. Interestingly, recurrences were predominantly at levels II-V in pN+ patients (88.0%), but were equally detected at both level VI (48.5%) and levels II-V (51.5%) in pN0 patients. This different distribution was likely due to the cancer localisation, as recurrence at levels II-V are more frequent in supraglottic tumours. In fact, lymph node relapsing patients were affected by supraglottic cancer in 56.0% of pN+ cases, if compared with the 24.2% of those pN0 (p < 0.05). Nevertheless, no differences in terms of tumour classification or use of adjuvant therapy were detected between relapsing and non-relapsing pN+ patients.
In the present cohort, patients with cartilage invasion at the inner cortex or through the outer cortex showed a greater probability to develop recurrences (RR = 3.4). This phenomenon is because the cartilage invasion demonstrates an extralaryngeal escape pathway. This aspect, if suspected pre-operatively, should always determine the recourse to a ND of the ipsilateral levels II-IV, but in particular to meticulous dissection of the central compartment of the neck as well as strap muscles resection and dissection of the pre-laryngeal tissue, immediately analysed by frozen sections. Considering the pattern of failure, the involvement of cartilages had no effect on T and M recurrence, but significantly correlated with that on N. Indeed, cartilage invasion increased the rate of recurrences on level VI lymph nodes (14/50, 28.0%, p < 0.05) rather than level II-V ones (10/50, 20.0%, p < 0.01), compared to patients with negative cartilage (5/58, 8.6%; and 29/58, 50.0%, respectively). The lack of significance at logistic regression of T classification, despite being strongly related to depth of cartilage invasion seems plausible to us because, beyond T4 tumours, many lesions classified as T3 had focal or multifocal invasion of internal lamina of thyroid cartilage. This phenomenon occurs more frequently in the lower aspect of the thyroid cartilage since the tumour often shows progression towards the crico-thyroid space. Even in the absence of full-thickness cartilage invasion, the behaviour of this subcategory of tumours, schematically represented by a subglottic extension more than 10 mm at the true vocal cord (TVC) midline, is to be considered similar to that of tumours staged in the upper category of T4a. Therefore, more cautious surgical resection should be preferred, characterised by careful dissection of level VI nodes.
For what concerns perineural invasion, although enhancing the overall risk of developing recurrences (RR = 2.4), the risk factor did not correlate per se with significant alteration of the pattern of failure. However, it is generally present in tumours characterised by advanced T stage and high histological grade classification, which are thus more refractory to treatments and show worse prognosis. Patients with perineural invasion should undergo strict follow-up to diagnose recurrences early. Moreover, this result gives rise to discussions in the tumour board about the necessity to treat patients affected by locally advanced tumours with adjuvant radiotherapy, possibly showing this negative prognostic factor for loco-regional recurrence.
Finally, regarding the type of surgery, we detected a higher risk of developing recurrences in cases treated by OPHL type III (RR = 2.3). We should keep in mind that supratracheal laryngectomies (OPHL type III) are generally employed in the treatment of more aggressive and advanced disease. Thus, more attention should be paid to this analysis.
Undoubtedly, OPHL type III extended indications of partial laryngectomy in case of cancers (glottic-subglottic tumours, T4a tumours) that, historically, were treated by total laryngectomy. Nevertheless, it determines a major rate of close margins, negative the frozen sections when the sample is collected on the side of the remnant larynx, but positive on the side of the specimen, generally correlates with a major rate of level VI lymph nodes metastasis. Although not mathematically, considering that the larynx also “accepts” minimal resection margins, this can expose patients to a greater number of loco-regional relapses (compared to those after OPHL type II) especially when detected as T indeterminate feature recurrences or on the level VI lymph nodes. Therefore, cases to be addressed to this surgical option must be selected very well.
OPHLs type III are safely indicated in case of T3 tumours with subglottic extension preferable < 10 mm at the TVC midline or in case of T4a “anterior” tumour 15, because these patients have demonstrated good oncologic results with a low percentage of recurrence. On the contrary, even T3 or T4a “posterior” tumours, where arytenoid fixity is related to an infraglottic extension > 10 mm at the TVC midline or to a massive posterior crico-arytenoid unit invasion, the tumour clearly acts aggressively as if it were always a T4.
OPHLs type III surgeries are therefore quite safe in first two cases, especially if the resection encompasses one crico-arytenoid unit. In the latter conditions, the safest treatment is total laryngectomy, also considering some disappointing events (positive margins, level VI pN+, ENE), that are more frequently associated with recurrence. Only in the case of categorical refusal by the patient to total laryngectomy, after informing about the risk of giving priority to the functional outcomes rather than to oncologic ones, in some very selected cases it is still possible to carry out an OPHL type IIIa. This option, even if not optimal, should be equally considered as chemoradiotherapy when drafting guidelines.
To our knowledge, this study is the first to use logistic regression on a very large cohort of patients treated by all different types of supracricoid and supratracheal partial laryngectomies (OPHL type II / III). The detection of clinical and pathological parameters that correlate with the development of recurrences (pN classification, cartilage involvement, perineural invasion, and thus the type of surgical treatment adopted) can be useful to reduce the event rate. Therefore, we suggest serious discussion in the multidisciplinary tumour board regarding the possible indications of OPHL, rather than resorting to a simpler and safer total laryngectomy or, alternatively, to concomitant chemoradiation-therapy, especially in cases where additional risk factors are present, such as the exiguity of surgical margins and use of more extensive surgeries.
In this delicate process, the patient and his/her caregivers also are involved, being important actors. With due delicacy, also analysing data from large series, they must be faced with and helped in choosing among the difficult dichotomy to give greater emphasis to a “quoad vitam” rather than to a “quoad functionem” prognosis.
Figures and tables
|No of patients (%)|
|Age||Mean ± standard deviation||60.2 ± 9.4|
|Arytenoid mobility||Normal||581 (70.9%)|
|pTN (VII ed.)||Glottic||Supraglottic|
|pT2||N0||201 (31.8%)||22 (11.8%)|
|N1||2 (0.3%)||4 (2.2%)|
|N2||3 (0.5%)||4 (2.2%)|
|pT3||N0||291 (46.0%)||86 (46.2%)|
|N1||13 (2.1%)||11 (6.0%)|
|N2||13 (2.1%)||23 (12.4%)|
|pT4||N0||94 (14.7%)||27 (14.4%)|
|N1||10 (1.6%)||4 (2.2%)|
|N2||6 (0.9%)||5 (2.6%)|
|Total||633 (77.3%)||186 (22.7%)|
|Positive||119 (16.7%)||21 (19.4%)||140 (17.1%)|
|Negative||592 (83.3%)||87 (80.6%)||679 (82.9%)|
|Type of surgery|
|OPHL Type II||620 (87.2%)||77 (71.3%)||697 (85.1%)|
|OPHL Type III||91 (12.8%)||31 (28.7%)||122 (14.9%)|
|Supraglottic||149 (21.0%)||32 (29.6%)||181 (22.1%)|
|Glottic||556 (78.2%)||73 (67.6%)||629 (76.8%)|
|Other||6 (0.8%)||3 (2.8%)||9 (1.1%)|
|pT1||3 (0.4%)||2 (1.9%)||5 (0.6%)|
|pT2||217 (30.5%)||17 (15.7%)||234 (28.6%)|
|pT3||385 (54.1%)||51 (47.2%)||436 (53.2%)|
|pT4||106 (14.9%)||38 (35.2%)||144 (17.6%)|
|pN0||645 (90.7%)||76 (70.4%)||721 (88.0%)|
|pN1||30 (4.2%)||13 (12.0%)||43 (5.3%)|
|pN2||36 (5.1%)||19 (17.6%)||55 (6.7%)|
|Basaloid||10 (1.4%)||3 (2.8%)||13 (1.6%)|
|G1||179 (25.2%)||11 (10.2%)||190 (23.2%)|
|G2||326 (45.9%)||45 (41.7%)||371 (45.3%)|
|G3||196 (27.6%)||49 (45.4%)||245 (29.9%)|
|Positive||116 (16.3%)||50 (46.3%)||166 (20.3%)|
|Negative||595 (83.7%)||58 (53.7%)||653 (79.7%)|
|Positive||194 (27.3%)||43 (39.8%)||237 (28.9%)|
|Negative||517 (72.7%)||65 (60.2%)||582 (71.1%)|
|Positive||119 (16.7%)||39 (36.1%)||158 (19.3%)|
|Negative||592 (83.3%)||69 (63.9%)||661 (80.7%)|
|Delphian lymph node pN+|
|Positive||19 (2.7%)||10 (9.3%)||29 (3.5%)|
|Negative||692 (97.3%)||98 (90.7%)||790 (96.5%)|
|Positive||18 (2.5%)||11 (10.2%)||29 (3.5%)|
|Negative||693 (97.5%)||97 (89.8%)||790 (96.5%)|
|Status of margins|
|Positive||55 (7.7%)||13 (12.0%)||68 (8.3%)|
|Close||29 (4.1%)||14 (13.0%)||43 (5.3%)|
|Negative||627 (88.2%)||81 (75.0%)||708 (86.4%)|
|Positive||67 (9.4%)||28 (25.9%)||95 (11.6%)|
|Negative||644 (90.6%)||80 (74.1%)||724 (88.4%)|
|Type of treatment||N (%)|
|IIa + ARY||354 (43.2%)|
|IIb + ARY||138 (16.9%)|
|IIIa + CAU||99 (12.1%)|
|IIIb + CAU||8 (1.0%)|
|Patients with recurrent tumours|
|Patients with non-recurrent tumours||93.4%||98.9%||100%||99.8%||93.2%||93.1%|
|Variable||Univariate analysis||Logistic regression model|
|Score test||P value||Score test||P value|
|Type of surgery||14.118||< 0.001||4.928||0.026|
|pT subcategory||16.389||< 0.001||0.100||0.752|
|pN ≥ 1 staging||15.742||< 0.001||15.643||< 0.001|
|Cartilage involvement||38.174||< 0.001||24.221||< 0.001|
|Perineural invasion||15.062||< 0.001||6.018||0.014|
|Delphian node pN+||5.033||0.025||0.155||0.694|
|Extranodal extension||16.620||< 0.001||2.253||0.133|
|Status of margins||6.124||0.013||1.253||0.263|
|Adjuvant treatments||14.393||< 0.001||0.859||0.354|
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